Reported contact with dogs (other than own dog) for Dog-owning (DO) and Dog-free (DF) households. The numbers indicate the number of respondents in each category. DO households were significantly more likely to have more frequent contact with dogs, compared to DF households (P < 0.001).
Westgarth et al. BMC Veterinary Research 2007 3:5 doi:10.1186/1746-6148-3-5